| 摘要 |
In a controlled mechanical ventilation plant for a colletive dwelling which includes a plurality of vertical suction columns (1, 2, 3) connected at the top to a horizontal network (4) coupled to at least one extraction fan (6), a device for controlling the useful extraction suction (partial vacuum) prevailing in each column, such as the mouth (8) of each column in the horizontal network, includes a shut-off shutter (10), of which the position with respect to its seat (9) that the edges of the abovementioned mouth constitute controls the position of a secondary shut-off member (15) for shutting off at least one orifice (16) for the intake of additional air into the horizontal network (4). <IMAGE>
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